问题
选择题
| The school rules state that no child shall be allowed out of the school during the day, _____ accompanied by an adult. |
A. once B. when C. if D. unless |
答案
答案：D
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| The school rules state that no child shall be allowed out of the school during the day, _____ accompanied by an adult. |
A. once B. when C. if D. unless |
答案：D